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Mat Slabs


Ribbed Slabs ] [ Mat Slabs ] California Slabs ]

The Post-tensioned Mat Slab is derived from criteria presented in UBC 1816 by incorporating the design output of the Ribbed Slab (PTI) and equating its calculated moment of inertia into an equivalent thick post-tensioned mat.  Some have no perimeter beams other than just a turned down edge to penetrate the grade.  Other applications can incorporate an deepened exterior beam to provide a moisture cutoff wall while increasing edge rigidity.

Illustrated is a mat slab prior to concrete placement

Interior stiffening beams are generally not used however thickened sections may occur to provide anchor bolt and/or hold down clearance where necessary.  Design criteria is the same as that required for the ribbed slab; ie. anticipated soil movement.



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